[UPDATE] Add a warning text of restarting Notepad++ for multi-instant mode.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1086 f5eea248-9336-0410-98b8-ebc06183d4e3
[BUG_FIXED] Fix open session on another instance while session to open path contain space.
[ENHANCEMENT] open session always on the same instance if no files opened in this instance.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1087 f5eea248-9336-0410-98b8-ebc06183d4e3
[UPDATE] Add new option "-L" in command line help dialog.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1088 f5eea248-9336-0410-98b8-ebc06183d4e3